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Trailer Wiring Kit for Land Rover LR3 Product Instructions

Applies To:

Item: YWJ500220ABP
Fits: LR3 / Discovery 3 | '05 - '09

We've specially-developed this trailer wiring package for LR3 vehicles. This kit seamlessly converts your Rover wiring plug to either a standard 'Flat 4' North American spec plug or 7-way plug (both connectors included!). Our quality harness kits are dependable and cost a fraction of the genuine versions. They feature a rubber plug cap to protect the exterior trailer plug from the elements and easy plug-and-go installation means they can be installed in minutes.

Parts included in Kit #YWJ500220ABP:
  • 4 ea. M5 x 0.8mm x 40mm machine screws
  • 1 ea. YMZ500770ABP harness with trailer connectors
  • 1 ea. YMZ500502ABP harness with vehicle connectors
  • 5 cable ties
  • Instructions
Tools Needed for Kit #YWJ500220ABP:
  • Phillips Head Screwdriver
  • 10 mm wrench

Install trailer wiring kit on LR3 video

Installation Procedure:

1. Remove the left taillight assembly by removing the 2 screws. The tail light will pull off. (See photo #1)

left taillight assembly
(photo 1)

2. Remove the Trailer Connector Access panel. (See photo #2)

trailer Connector Access panel
(photo 2)

3. The YWJ500220ABP Wiring Harness comes in 2 parts. One part with the connectors that plug into the Trailer, and the second part with the connectors that plug into the vehicle.

4. Take the part with the trailer connectors and feed the harness through the opening in the bumper (the hole on the left). Maneuver the trailer connector through the opening. (It may take some twisting and turning, but it will fit.)

5. Secure the connector with the 4 screws provided. (See photo # 3.)

secure the connector
(photo 3)

6. Remove the access panel in the left rear of the cargo area of the vehicle and find the 2 gray connectors toward the top of the open area and the round black grommet toward the bottom. (See photo # 4.)

(photo 4)

7. The gray connectors are held in place by 2 "dummy" connectors. Pull both of the connectors from their mounting brackets and remove the "dummy} connectors. Remove the rubber grommet as well. (See photo # 5.)

gray connectors and wiring
(photo 5)

8. Find a second rubber grommet behind the tail light assembly and remove it. (See photo # 6.)

second rubber grommet behind the taillight assembly
(photo 6)

9. Feed the wiring harness with the vehicle connectors through the 2 holes in the vehicle, making sure that the gray connectors that will plug into the car are facing toward the inside. (See photo # 7.)

wiring harness
(photo 7)

10. Once the cable is all the way through both of the holes in the vehicle, push the grommets into place.

11. Plug the 2 gray connectors of the trailer wiring harness into the gray plugs of the vehicle harness and snap into place on the brackets.

12. Remove the nut from the grounding stud (10mm) and secure the ring lug of the trailer wiring harness to this stud. Secure the harness to the vehicle with the fir-tree cable tie on the harness.

13. Remove the spare tire, so you have room to run the cable underneath the car.

14. Run the cable along the opening underneath the car directly behind the bumper and maneuver the end with the connector such that it comes out in the opening where you removed the tail light assembly. (See photo # 8.)

run the cable
(photo 8)

15. Once you can see the connectors in the area behind the tail light (See photo # 9), connect them to the harness that you fed from inside the vehicle. (See photo # 10.)

connectors to the harness
(photo 9)

connectors to the harness
(photo 10)

16. Make sure that the connectors are completely seated (you should hear a snap when the connectors are fully engaged). Push the white plastic locking tabs forward to secure the connectors. (See photo # 11.)

push the white plastic locking tabs forward to secure the connectors
(photo 11)

17. Wrap these connectors with the foam provided so they will not rattle around in the area below the tail light assembly.

18. Secure the trailer connector end of the harness under the vehicle with the fir-tree cable tie as seen in photo # 12.

secure the trailer connector end of the harness
(photo 12)

19. Test the installation.

20. Reinstall the spare tire, tail light assembly, trailer access panel and the access panel in the left rear of the cargo area of the vehicle.

21. If your vehicle was not already configured for towing, you must have the body control module re-configured for trailer ball at a Land Rover dealer or Land Rover capable shop or someone who can access the module with a diagnostic scan tool.

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